Odd issue regarding text.

All the "a"'s and "e"'s on my system are showing up with a black line except when that object is highlighted. It's not on any menu, it seems to only be in certain areas, like the Finder and windows titles.

It can be seen here:

and here:

HOWEVER, in some areas it doesn't show up at all such as here:

And here:

ALSO, I noticed it showed up randomly on Facebook:

And sometimes on other websites, but not on MacRumors. What's the issue here?

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